Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0a4cce2f624452b…

MALICIOUS

PDF

92.8 KB Created: 2021-08-27 01:06:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 63b98035b8a5b751dfa05c7a2afdb141 SHA-1: 04a5330527ea1760a187deb4589641e6a4c7935e SHA-256: f0a4cce2f624452b92ba45b1cec8fcd744480b5e7c9d383da24bf0df9eba42dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The presence of link farms on disposable hosting suggests an effort to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16090baafc9bbf---28729466162.pdf In PDF document text
    • http://sintellect.ru/Repository/file/62231710615.pdfIn PDF document text
    • http://herve-coiffure.ci/files/88015562089.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/97236259495.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736e152fb36---92873129286.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/25582217045.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/fmdnd70is18of57ihnfh1ouhjv/xajujapelenusuzasiditokuz.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751833cad70---40789348129.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/guragegufev.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/21q22eks1evvi4iavvrncv7ph3/xibumifol.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/24180552688.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a9263bdcab0---46669130585.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/jaripusi.pdfIn PDF document text
    • http://thebrownsfamilyreunion2008.com/clients/81208/File/66717957130.pdfIn PDF document text
    • http://burrburroughsfamily.com/clients/55468/File/mufuz.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/68661018823.pdfIn PDF document text
    • http://karunb.com/UpLoads/files/97356883710.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210611010536.pdfIn PDF document text
    • https://avenue102.com/uploads/file/53968495005.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/bifedovewudosomemu.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/95424956337.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210819_042237.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/0covfqkvgr1qgqbdf10coh5s02/19849086365.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/ccmk1iruehe9qkdsnafk1m11ua/fosuzibadibuzekenab.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/55112058413.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=peter+norton+introduction+to+computers+7th+editionPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B2 10720 bytes
SHA-256: f0587075ae77d659b6bfe68eeafffa43e4f0a500bc9b9f3fa90230d48d48eb16
font_01_sfnt_off00011e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E25 17484 bytes
SHA-256: b7ad20d8e062182eb486585c3cc194979ebbf3851a3ba2221d176618f8d2b086
font_02_sfnt_off00014bd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1